"Some time in the 1920s, Sam Goldwyn went to Vienna to ask Sigmund Freud to write him a screenplay. He wanted to bill it as 'the greatest love story from the world's most famous doctor of love,' but Freud scotched the idea. Around the same time, Sergei Eisenstein, another man not short on ambition, conceived a desire to film Karl Marx's doorstopper 'Das Kapital.' Vetoed by Stalin, that film was never made either. Now, however, Canadian artist Mark Lewis has made these 'Two Impossible Films,'" Samantha Ellis reports for The Guardian.